MSPA corridors ranged in width from 30m to 120m, a minimum recommended corridor width of 350m was used in Maryland (Weber et al., 2006), and southeastern USA corridor width was dependent on the inputs to their least-cost path analysis. Field studies of corridor width show similar variability. Field studies showing positive effects had corridor widths ranging from 25m (Tewksbury et al., 2002) to 100m wide (Robichaud et al., 2002) to 150m wide (Mech and Hallett, 2001). Interestingly, Levey et al. (2005) found that it was the contrast (i.e., edge) between the corridor and the surrounding land coverthatprovidedtheconduitbetweenhabitatpatches,suggestingthatcorridorpresenceratherthanwidthmaybeadetermining factor,atleastforsomespecies.Kohutetal.(2009)foundthatcorridor width was not a significant factor for explaining abundance and richness of forest interior birds in a North Carolina, USA urban setting. Our choices for MSPA modeling also affected our results, and hence comparisons with the Maryland (Weber et al., 2006) and southeasternUSAgreeninfrastructurenetworks(Carretal.,2002). RoadsareidentifiedreliablyintheNLCD2001(Homeretal.,2007) and the NLCD land-cover change data (Fry et al., 2009) because of the modeling used to derive NLCD 2001 land cover (Homer et al., 2004)
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